过热区 meaning in Chinese

over heated zone
overheated zone
superheat region

The results show that , when the hardfacing process is not appropriate , the thick martensite structure with high carbon content will form in the overheat region of heat affected zone , and the high residual stress occurred , which are the primary causes resulting in crack
结果表明，堆焊工艺制定不当，热影响区的过热区形成高碳粗大马氏体组织及保留了较大的焊接应力，是导致堆焊层开裂的主要原因。